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【单选题】
在如图所示的单缝夫琅衍射装置中,将单缝宽度a稍梢变宽,同时使单缝沿y轴正方向作微小平移(透镜屏幕位置不动),则屏幕C上的中央衍射条纹将( )A.
变窄，同时向上移
B.
变窄，同时向下移
C.
变窄，不移动
D.
变宽，同时向上移
E.
变宽，不移动
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